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Finding the Fourth Proportional to 132.89, 199.20 and 86.63

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Solution

The fourth proportional to 132.89, 199.20 and 86.63 is: 129.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.89 : 199.20 = 86.63 : x
  2. Step 2: Convert to fraction form
    132.89/199.20 = 86.63/x
  3. Step 3: Cross multiply
    132.89x = 199.20 × 86.63
  4. Step 4: Simplify right side
    132.89x = 17,256.70
  5. Step 5: Solve for x
    x = 17,256.70/132.89
  6. Step 6: Final answer
    x = 129.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.